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From "Qi Liu (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-6071) Namenode GUI does not show actual memory usage
Date Wed, 17 Jun 2009 18:20:07 GMT
Namenode GUI does not show actual memory usage

                 Key: HADOOP-6071
                 URL: https://issues.apache.org/jira/browse/HADOOP-6071
             Project: Hadoop Core
          Issue Type: Improvement
          Components: dfs
    Affects Versions: 0.18.3
            Reporter: Qi Liu
            Priority: Minor

In the namenode GUI, the showed memory usage is not the actual memory usage. Instead, it is
the memory currently allocated to Java (Runtime.totalMemory()). That's why we see most of
the time, the memory usage is 100%. This is a concern for operation, since this is the only
page we can monitor the memory usage of a name node. Showing 100% makes the wrong impression
that there is a memory leak in name node, and the name node needs to be restarted.

The current value should show would be Runtime.totalMemory() - Runtime.freeMemory().

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